The invention discloses a multi-shaft absorbing pneumatic drive type wave energy air collecting device for artificial upwelling. A base is mounted outside a rolling swing, and connected with the rolling swing rotatably by use of a first shaft and a second shaft; a first gear is mounted on the second shaft; a first cylinder is fixed on a first rack; the two ends of the piston rod of the first cylinder are fixed on the base; the first gear is engaged with the first rack; a pitching swing is mounted in the rolling swing, and rotatably connected with the rolling swing by use of a third shaft and a fourth shaft; a second gear is fixedly mounted on the fourth shaft; a second cylinder is fixed on a second rack; the two ends o the piston rod of the second cylinder are fixed on the rolling swing; the second gear is engaged with the second rack; a third cylinder is fixedly mounted in the center of the lower surface of the pitching swing, and a floating body is fixedly connected to the lower surface of the piston rod of the third cylinder. The multi-shaft absorbing pneumatic drive type wave energy air collecting device is capable of converting the wave energy in a plurality of wave coming directions into pneumatic energy, and is used for lifting the deep seawater rich in nutritional salts to the euphotic layer to realize artificial upwelling by injecting air into the sea floor, thereby promoting the growth of fishes.